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JVC TD-WS305TN A - Page 28

JVC TD-WS305TN A
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point
value
REC/PB
This
step
must
be
performed
after
|Deck
[B]
12.5
kHz
level:
|
Normal
tape.
frequency
the
slave
oscillation
adjustment.
L-ch:
VRB31|0+0.5
dB
Adjust
VRs
to
flatten
levels
of
response
Record
the
1
KHz
and
12.5
kHz
sig-
|
R-ch:
VRB41
|
higher
than
the
|
the
1kHz
and
12.5
kHz
signals
adjustment
nals
at
the
level
of
—20
dB
(20
dB
1
kHz
level.
basically.
lower
than
the
reference
level).
Playing
back
the
recorded
signals,
adjust
VRB31
and
VRB41
so
that
the
level
of
the
12.5
kHz
signal
is
0
+
0.5
dB
to
the
level
of
the
1
kHz
signal.
*7
|
Recording
1)
Apply
a1
kHz
signal
to
the
LINE
|
Deck
Normal:
NR
switch
:
Off
level
IN
terminals,
record
a
1
kHz
sig-
|
L:
VR106
—8
+
0.5
dBs
|
TAPE
switch
:
Norma!
adjustment
nal
at
—2U
dBs
input
for
both
(L_
|
R:VR206
|
CrO,/Metal:
and
R)
channels
ona
normal
tape.
—8
+2
dBs
2)
Play
back
the
recorded
part,
and
adjust
the
recording
level
con-
trols
so
that
LINE
OUT
terminal
level
becomes
—8
dBs.
Then
ad-
just
VR106
and
VR206
so
that
LINE
OUT
terminal
comes
—8
dBs.
level
be-
Record
a
1
kHz,
-—20dBs
signal
to
LINE
IN
terminals.
Play
back
the
recorded
part.
Check
the
output
with
a
distor-
tion
meter
to
see
if
the
value
con-
forms
to
the
standard
value.
Checking
record/
playback
distortion
2
—
Checking
signal
to
noise
ratio
in
recording/
playback
1)
Record
a
1
kHz,
—20
dBs
signal.
Stop
the
input
by
disconnecting
from
the
terminal
to
perform
non-signal
recording.
Play
back
the
recorded
part.
Mea-
sure
the
—8
dBs
recording
output
and
the
non-signal
recording
out-
put
for
comparison
using
an
elec-
tronic
voltmeter.
Check
to
see
if
the
value
conforms
to
the
stand-
ard
value.
2
~—
Checking
erasing
coefficient
1)
Apply
a
1kHz,
—20
dBs
signal
to
the
LINE
IN
terminals.
2)
Perform
recording
with
the
signal
enhanced
by
20
dB.
3)
Erase
a
part
of
the
recording.
4)
Measure
the
output
difference
between
the
erased
part
and
non-
erased
part
to
compare
with
an
electronic
voltmeter.
Normal
tape:
Less
than
2%
CrO,
tape:
Less
than
3%
Metal
tape:
Less
than
2%
(THD)
Normal,
CrO,
&
Metal
tapes:
More
than
55dB
More
than
42 dB
TD-W304BK/
-W305TNwercvercu
Be
sure
to
perform
this
checking
following
bias
current
and
record-
ing
level
checking.
Apply
an
input
level
to
LINE
IN
terminals
with
the
recording
level
controls
set
to
maximum
so
that
the
peak
level
indicator
reads
0
dB.
For
the
measurement
using
a
metal
tape,
connect
a
band
pass
filter
between
the
deck
and
the
electronic
voltmeter.
Input
{1
kHz)
(1
kHz)
.
Electronic
Band
pa
Iter
(No.
4325-1)
11
Tape
deck
(recording,
erasing)

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